A) \[125\,\,mg\]
B) \[62.5\text{ }mg\]
C) Nothing will be left
D) \[31.25\text{ }mg\]
Correct Answer: B
Solution :
Given, \[{{T}_{1/2}}=5.25\,yr\] \[t=21yr\] Number of half lives \[n=\frac{t}{{{T}_{1/2}}}=\frac{21}{5.25}=4\] Amount of sample left \[={{\left( \frac{1}{2} \right)}^{4}}\times 1\,g\] \[=\frac{1}{16}g\] or \[62.5mg\]
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